net_instaweb::spriter::ImageLibraryInterface Class Reference

#include "image_library_interface.h"

Inheritance diagram for net_instaweb::spriter::ImageLibraryInterface:

Classes
class	Canvas
class	Delegate
class	Image
	Images are immutable rectangular regions of pixels. More...

Public Types
typedef GoogleString	FilePath

Public Member Functions
virtual Image *	ReadFromFile (const FilePath &path)=0
virtual Canvas *	CreateCanvas (int width, int height)=0
	ImageLibraryInterface (Delegate *delegate)

Static Public Member Functions
static ImageLibraryInterface *	ImageLibraryInterfaceFactory (const GoogleString &library_name)
	Use this factory method to get a usable image library object.

Protected Member Functions
	ImageLibraryInterface (const FilePath &base_input_path, const FilePath &base_output_path, Delegate *delegate)
	Use ImageLibraryInterfaceFactory() to access an image library.
const FilePath &	base_input_path ()
	Used by subclasses:
const FilePath &	base_output_path ()
const Delegate *	delegate ()

Detailed Description

Class ImageLibraryInterface provides an abstract interface to manipulate images. This interface hides the details of any particular image processing library. This makes it easy to port to an environment where a different image processing library is preferred.

Subclasses create methods that act on two types of objects:

• Image: An imitable rectangular region of pixels.
• Canvas: A mutable rectangular region of pixels.

Member Typedef Documentation

typedef GoogleString net_instaweb::spriter::ImageLibraryInterface::FilePath

Todo:

TODO(skerner): Chromium's base lib has a class FilePath that handles paths in a cross-platform way. Use it.

Constructor & Destructor Documentation

net_instaweb::spriter::ImageLibraryInterface::ImageLibraryInterface ( Delegate *  delegate )

inlineexplicit

Constructor for custom subclasses. Prefer to use ImageLibraryInterfaceFactory() if possible.

Member Function Documentation

virtual Image* net_instaweb::spriter::ImageLibraryInterface::ReadFromFile ( const FilePath &  path )

pure virtual

Read an image from disk. Return NULL (after calling delegate method) on error. Caller owns the returned pointer.

Implemented in net_instaweb::spriter::LibpngImageLibrary.

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The documentation for this class was generated from the following file:

• net/instaweb/spriter/image_library_interface.h